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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faad9fbc0e8e294469c8c1ad755233de8beb56073a3708547924497f172fc89' 
  AND token = 'DZo2D8zQT7Kn3L2jdJRc0L/kRjR2MxzlWFismajcSEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}